* Added a 'GPIO_EVENTS' table to the database.
* Incremented the database version to 240.
* Implemented GPIO event logging in 'ripcd/local_macros.cpp' and
'ripcd/ripcd.h'.
* Added an 'Events Log' area to RDGpiMon(1) in
'utils/rdgpimon/rdgpimon.cpp' and 'utils/rdgpimon/rdgpimon.h'.
* Added code in rdmaint(1) to purge logged GPIO events in
'utils/rdmaint/rdmaint.cpp' and 'utils/rdmaint/rdmaint.h'.
* Added an 'RDMatrix::BtGpi16' value to the 'RDMatrix::Type'
enumeration in 'lib/rdmatrix.cpp' and 'lib/rdmatrix.cpp'.
* Implemented a driver for the Broadcast Tools GPI-16 in
'ripcd/btgpi16.cpp' and 'ripcd/btgpi16.h'.
* Fixed a bug in 'lib/rdcut.cpp' that caused the 'Title' value
to be applied to the 'Description' field in the 'RDCut::setMetadata()'
method.
* Added 'docs/metadata_wildcards.txt'.
* Implemented support for the '%i' ['Cut Description'] wildcard in
rdimport(1)'s '--metadata-pattern' switch in
'utils/rdimport/rdimport.cpp' [Github Issue #6].
* Implemented support for the '%o' ['Outcue'] wildcard in
rdimport(1)'s '--metadata-pattern' switch in
'utils/rdimport/rdimport.cpp'.
* Implemented support for the '%y' ['Release Year'] wildcard in
rdimport(1)'s '--metadata-pattern' switch in
'utils/rdimport/rdimport.cpp'.
